21.What is the correct Lewis structure for hypochlorous acid, a compound containing chlorine, hydrogen and oxygen?A.B.C. D.2.Which compound forms hydrogen bonds in the liquid state?A.C2H5OH B.CHCl3 C.CH3CHO D. (CH3CH2)3N3.How do the bond angles in CH4, NH3 and H2O compare?A.CH4 = NH3 = H2OB.CH4 < NH3 < H2OC.NH3 < CH4 < H2OD.H2O < NH3 < CH44.Which combination of the characteristics of element X, a metal, and element Y, a non metal, is most likely to lead to ionic bonding?XYA.low ionization energyhigh electronegativity valueB.low ionization energylow electronegativity valueC.high ionization energyhigh electronegativity valueD.high ionization energylow electronegativity value5.Which particles are responsible for electrical conductivity in metals?A.AnionsB.CationsC.ElectronsD.Protons 6.Explain why:(i)calcium has a higher melting point than potassium.........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................(2)(ii)sodium oxide has a higher melting point than sulfur trioxide...............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................(3)7.Describe and compare three features of the structure and bonding in the three allotropes of carbon: diamond, graphite and C60 fullerene.................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................(Total 6 marks)8.Draw the Lewis structure of CO2 and predict its shape and bond angle.................................................................................................................................................................................................................................................................................................(Total 2 marks)9.Describe the structure and bonding in SiO2.................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................(Total 2 marks)10.Explain why silicon dioxide is a solid and carbon dioxide is a gas at room temperature.................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................(Total 2 marks)11.Describe the bonding within the carbon monoxide molecule.................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................(Total 2 marks)12.How many and bonds are present in a molecule of propyne, CH3CCH?A.53B.62C.71D.8013.Which species does not contain delocalized electrons?A.CH3CH2OB.CH3CO2C.O3D.NO314.The Lewis structure of SO2 is given below.What is the shape of the SO2 molecule?A.Bent (V-shaped)B.LinearC.T-shapedD. Triangular planar15.The graph below illustrates how the vapour pressures of ethoxyethane, CH3CH2OCH2CH3, benzene, C6H6, and water, H2O, change with temperature.(a)Using data from the graph, explain the difference in vapour pressure of ethoxyethane, benzene and water at 30 C.....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................(4) (b)Use the graph to determine the boiling point of benzene at standard pressure.......................................................................................................................................(1)16.Describe the delocalization of pi () electrons and explain how this can account for the structure and stability of the carbonate ion, CO32.................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................(Total 3 marks)17.Explain the meaning of the term hybridization. State the type of hybridization shown by the carbon atoms in carbon dioxide, diamond, graphite and the carbonate ion.................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................(Total 5 marks)18.Explain the electrical conductivity of molten sodium oxide and liquid sulfur trioxide.................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................(Total 2 marks)19.Which molecule has a non-bonding (lone) pair of electrons on the central atom?A.BF3B.SO2C.CO2D.SiF420.When C2H2, C2H4 and C2H6 are arranged in order of increasing carbon-carbon bond strength (weakest bond first), what is the correct order?A.C2H2, C2H4, C2H6B.C2H2, C2H6, C2H4C.C2H6, C2H4, C2H2D.C2H6, C2H2, C2H421.The number of electrons in the valence shell of elements A and B, are 6 and 7 respectively. What is the formula and type of bonding in a compound formed by these elements?A.A2B, covalentB.AB2, covalentC.A2B, ionicD.AB2, ionic22.Lewis structures are represented in different ways in different parts of the world. Two ways of drawing the Lewis structure for H3O+ are shown below.Which statement is correct about H3O+?A.The ion has a tetrahedral shape.B.The HOH bond angle is 120.C.The HOH bond angle is 90. D.The ion has a trigonal pyramidal shape.23.Which particles are responsible for the conduction of electricity in molten aluminium?A.Cations B.AnionsC.ElectronsD.Protons24.The element antimony, Sb, is usually found in nature as its sulfide ore, stibnite, Sb2S3. This ore was used two thousand years ago by ancient Egyptian women as a cosmetic to darken their eyes and eyelashes.(a)(i)Deduce the oxidation number of antimony in stibnite............................................................................................................................(1)(ii)Deduce one other common oxidation number exhibited by antimony in some of its compounds............................................................................................................................(1) (b)One method of extracting antimony from its sulfide ore is to roast the stibnite in air.This forms antimony oxide and sulfur dioxide. The antimony oxide is then reduced by carbon to form the free element.(i)Deduce the chemical equations for these two reactions.......................................................................................................................................................................................................................................................(2) (ii)Identify two different environmental concerns associated with this method of extraction..................................................................................................................................................................................................................................................................................................................................................................................(2)25.Methoxymethane, CH3OCH3, and ethanol, C2H5OH, have the same relative molecular mass.Explain why methoxymethane has a much lower boiling point than ethanol.................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................26.Ammonia, NH3, is a weak base.(i)Draw the Lewis structure of ammonia and state the shape of the molecule and its bond angles...................................................................................................................................................................................................................................................................................................................................................................................................................(3)(ii)The conjugate acid of ammonia is the ammonium ion, NH4+. Draw the Lewis structure of the ammonium ion and deduce its shape and bond angles...................................................................................................................................................................................................................................................................................................................................................................................................................(3)27.How many sigma and pi bonds are there in propyne, CH3CCH?A.2 sigma and 2 pi B.7 sigma and 1 piC.6 sigma and 2 piD.5 sigma and 3 pi 28.Which species does not have delocalized electrons?A.NO3B.NO2C.O3D.C3H629.In which compound are all the carbon atoms sp2 hybridized?30.Which combination of intermolecular forces, boiling point and enthalpy of vaporization is correct?Intermolecular forcesBoiling pointEnthalpy of vaporizationA.stronglowlowB.stronghighlowC.weaklowhighD.weaklowlow31.Which is the best description of the bonding present in the ammonium ion, NH4+?A.Sharing of electrons between atomsB.Electrostatic attraction between ionsC.Electrostatic attraction between positive ions and delocalized electronsD.Sharing of electrons between atoms and electrostatic attraction between ions32.The formula of cerium(III) sulfate is Ce2(SO4)3. What is the correct formula of cerium(III) phosphate?A.CeP B.Ce2(PO4)3C.Ce3(PO4)2D.CePO433.Which molecule has the shortest carbon-oxygen bond length?A.CH3COOHB.CH3CH2OHC.CO2D.CO34.Which pair of compounds is arranged in correct order of relative boiling points?Lower Boiling PointHigher Boiling PointA.H2SH2OB.NH3PH3C.HFHClD.CH3COOHCH3CH2OH35.Which statement about the bonding between carbon atoms is correct?A.In C60 fullerene each carbon atom is covalently bonded to three other carbon atoms.B.In C60 fullerene each carbon atom is covalently bonded to four other carbon atoms.C.In graphite each carbon atom is covalently bonded to four other carbon atoms.D.In graphite each carbon atom forms a double covalent bond with three other carbon atoms.36.Which intermolecular forces exist between molecules of carbon monoxide, CO?A.Hydrogen bonds and van der Waals forcesB.Dipole-dipole attractions and van der Waals forcesC.Van der Waals forces onlyD.Dipole-dipole attractions only37.Chloroethene, C2H3Cl, is an important organic compound used to manufacture the polymer poly(chloroethene).(i)Draw the Lewis structure for chloroethene and predict the H C Cl bond angle.......................................................................................................................................(2) (ii)Draw a section of poly(chloroethene) containing six carbon atoms.(1)(iii)Outline why the polymerization of alkenes is of economic importance and why the disposal of plastics is a problem....................................................................................................................................................................................................................................................................................................................................................................................................................(2)38.Which pair of compounds is arranged in correct order of relative boiling points?Lower Boiling PointHigher Boiling PointA.CH3OCH3CH3CH2OHB.CH3CHOCH3CH2CH3C.CH3CH2OHCH3CHOD.CH3COOHCH3CH2OH39.Which statements about and bonds are correct?I. bonds result from the axial overlap of orbitals.II. bonds only form from s orbitals.III. bonds result from the sideways overlap of parallel p orbitals.A.I and II onlyB.I and III onlyC.II and III onlyD.I, II and III40.In which substance does a carbon atom have sp2 hybridization?A.2-methylbutan-1-olB.Propyne, CH3CCHC.C60 fullereneD.Diamond(Total 1 mark) 41.What is the formula of magnesium fluoride?A.Mg2F3B.Mg2FC.Mg3F2D.MgF2(Total 1 mark) 42.What is the shape of the ammonia molecule, NH3?A.Trigonal planarB.Trigonal pyramidalC.LinearD.V-shaped (bent)(Total 1 mark)43.Which molecule is polar?A.CH2Cl2B.BCl3C.Cl2D.CCl4(Total 1 mark) 44.Which substance can form intermolecular hydrogen bonds in the liquid state?A.CH3OCH3B.CH3CH2OHC.CH3CHOD.CH3CH2CH3(Total 1 mark) 45.Which compound has a covalent macromolecular (giant covalent) structure?A.MgO(s)B.Al2O3(s)C.P4O10(s)D.SiO2(s)(Total 1 mark) 46.One important property of a rocket fuel mixture is the large volume of gaseous products formed which provide thrust. Hydrazine, N2H4, is often used as a rocket fuel. The combustion of hydrazine is represented by the equation below.N2H4(g) + O2(g) N2(g) + 2H2O(g)HcO = 585 kJ mol1(a)Hydrazine reacts with fluorine to produce nitrogen and hydrogen fluoride, all in the gaseous state. State an equation for the reaction.............................................................................................................................................................................................................................................................................(2) (b)Draw the Lewis structures for hydrazine and nitrogen.(2) (c)Use the average bond enthalpies given in Table 10 of the Data Booklet to determine the enthalpy change for the reaction in part (a) above.....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................(3)(d)Based on your answers to parts (a) and (c), suggest whether a mixture of hydrazine and fluorine is a better rocket fuel than a mixture of hydrazine and oxygen.........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................(2)(Total 9 marks) 47.(i)Define the term first ionization energy of an atom.(2) (ii)Explain the general increasing trend in the first ionization energies of the period 3 elements, Na to Ar.(2) (iii)Explain why sodium conducts electricity but phosphorus does not.(2)(Total 6 marks) 48.What is the electron configuration of Fe3+?A.[Ar]4s23d6B.[Ar]3d5C.[Ar]4s23d5D.[Ar]4s23d3(Total 1 mark)49.Which species have a dative covalent bond?I.COII.NH3III.H3O+A.I and II onlyB.I and III onlyC.II and III onlyD.I, II and III(Total 1 mark) 50.The Lewis structure of XeF2 contains two bonding pairs of electrons and three non-bonding pairs of electrons (lone pairs) around the central xenon atom. What is the shape of XeF2 molecule?A.BentB.Trigonal bipyramidalC.Square planarD.Linear(Total 1 mark) 51.How many sigma () bonds are present in (CH3)2C=CClCH2CH3?A.1B.4C.16D.17(Total 1 mark)52.The electronegativities of four different elements are given below (the letters are not their chemical symbols).ElementWXYZElectronegativity0.91.23.44.0Based on this information which statement is correct?A.W is a non-metal.B.W and X form an ionic compound.C.Y is a metal.D.Y and Z form a covalent compound.(Total 1 mark) 53.Which species contain a dative covalent bond?I.HCHOII.COIII.H3O+A.I and II onlyB.I and III onlyC.II and III onlyD.I, II and III(Total 1 mark)54.Which substance is made up of a lattice of positive ions and free moving electrons?A.GraphiteB.Sodium chlorideC.SulfurD.Sodium(Total 1 mark) 55.Which order is correct when the following compounds are arranged in order of increasing melting point?A.CH4 < H2S < H2OB.H2S < H2O < CH4C.CH4 < H2O < H2SD.H2S < CH4 < H2O(Total 1 mark) 56.Describe the bonding in iron and explain the electrical conductivity and malleability of the metal.................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................(Total 4 marks)57.Ethene, C2H4, and hydrazine, N2H4, are hydrides of adjacent elements in the periodic table.(a)(i)Draw Lewis (electron dot) structures for C2H4 and N2H4 showing all valence electrons.(2) (ii)State and explain the HCH bond angle in ethene and the HNH bond angle in hydrazine.(5) (b)The polarity of a molecule can be explained in terms of electronegativity.(i)Define the term electronegativity.(2) (ii)Compare the relative polarities of the CH bond in ethene and the NH bond in hydrazine.(1) (iii)Hydrazine is a polar molecule and ethene is non-polar. Explain why ethene is non-polar.(1) (c)The boiling point of hydrazine is much higher than that of ethene. Explain this difference in terms of the intermolecular forces in each compound.(2)(Total 13 marks) 58.The reaction between N2H4(aq) and HCl(aq) can be represented by the following equation.N2H4(aq) + 2HCl(aq) N2H62+(aq) + 2Cl(aq)(i)Identify the type of reaction that occurs.(1)(ii)Predict the value of the HNH bond angle in N2H62+.(1)(Total 2 marks) 59.The graph below shows the first four ionization energies of four elements A, B, C and D (the letters are not their chemical symbols). Which element is magnesium?(Total 1 mark) 60.Which molecule has an octahedral shape?A.SF6B.PCl5C.XeF4D.BF3(Total 1 mark)61.Which species have delocalized electrons?A.I and II onlyB.I and III onlyC.II and III onlyD.I, II and III(Total 1 mark) 62.(a)But-2-ene is a straight-chain alkene with formula C4H8. The molecule contains both and bonds.(i)Explain the formation of the bond.............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................(2) (ii)For each of the carbon atoms, C(1) and C(2), identify the type of hybridization shown.C(1): ..................................................................................................................C(2): ..................................................................................................................(1) (b)But-2-ene shows geometrical isomerism. Draw the structural formula and state the name of the other geometrical isomer.......................................................................................................................................(2) (c)Identify the structural formula of an isomer of but-2-ene which does not decolorize bromine water, Br2(aq).(1)(Total 6 marks) 63.The reaction between N2H4(aq) and HCl(aq) can be represented by the following equation.N2H4(aq) + 2HCl(aq) N2H62+(aq) + 2Cl(aq) (i)Identify the type of reaction that occurs.(1) (ii)Predict the value of the HNH bond angle in N2H62+.(1) (iii)Suggest the type of hybridization shown by the nitrogen atoms in N2H62+.(1)(Total 3 marks) 64.What are the correct formulas of the following ions?AmmoniumHydrogencarbonatePhosphateA.NH4+HCO32PO4B.NH3+HCO3PO43C.NH4+HCO32PO42D.NH4+HCO3PO43(Total 1 mark) 65.What happens when magnesium metal reacts with chlorine gas?A.Each magnesium atom loses two electrons and each chlorine atom gains two electrons.B.Each magnesium atom gains one electron and each chlorine atom loses one electron.C.Each magnesium atom loses two electrons and each chlorine atom gains one electron.D.Each magnesium atom gains one electron and each chlorine atom loses two electrons.(Total 1 mark)66.Which is the best description of ionic bonding?A.The electrostatic attraction between positively charged nuclei and an electron pairB.The electrostatic attraction between positive ions and delocalized negative ionsC.The electrostatic attraction between positive ions and delocalized electronsD.The electrostatic attraction between oppositely charged ions(Total 1 mark) 67.Which is the best description of the bonding present in silicon dioxide, SiO2?A.Each silicon atom forms four single covalent bonds to oxygen atoms.B.Each silicon atom forms two double covalent bonds to oxygen atoms.C.Each silicon atom forms two single covalent bonds to oxygen atoms.D.Each silicon atom forms four double covalent bonds to oxygen atoms.(Total 1 mark) 68.(i)Draw the Lewis structures for carbon monoxide, CO, carbon dioxide, CO2 and methanol, CH3OH.(3)(ii)List, with an explanation, the three compounds in order of increasing carbon to oxygen bond length (shortest first).(2)(Total 5 marks)69.Predict the shape and bond angles for the following species:(i)CO2(2)(ii)CO32(2)(iii)BF4(2)(Total 6 marks) 70.Which statements best describe the structure of sodium chloride, NaCl?I.Each sodium ion is surrounded by six chloride ions.II.The chloride ions are arranged octahedrally around each sodium ion.III.The lattice forms a cubic structure.A.I and II onlyB.I and III onlyC.II and III onlyD.I, II and III(Total 1 mark) 71.Which molecule contains a dative covalent (coordinate) bond?A.HCNB.H2O2C.CO2D.CO(Total 1 mark)72.Identify the hybridization of carbon atoms in this molecule1234A.sp3sp2sp2sp2B.sp2sp2sp2spC.sp3spsp2spD.spsp2spsp2(Total 1 mark) 73.Which structure has delocalized electrons?A.O3B.COC.HCND.CO2(Total 1 mark) 74.Draw the Lewis structures, state the shape and predict the bond angles for the following species.(i)PCl3(3) (ii)NH2(3)(iii)XeF4(3)(Total 9 marks) 75.Which statement best describes the intramolecular bonding in HCN(l)?A.Electrostatic attractions between H+ and CN ionsB.Only van der Waals forcesC.Van der Waals forces and hydrogen bondingD.Electrostatic attractions between pairs of electrons and positively charged nuclei(Total 1 mark) 76.Which statement best describes metallic bonding?A.Electrostatic attractions between oppositely charged ionsB.Electrostatic attractions between a lattice of positive ions and delocalized electronsC.Electrostatic attractions between a lattice of negative ions and delocalized protonsD.Electrostatic attractions between protons and electrons(Total 1 mark) 77.Metal M has only one oxidation number and forms a compound with the formula MCO3.Which formula is correct?A.MNO3B.MNH4C.MSO4D.MPO4(Total 1 mark)78.Which molecule has the shortest bond between carbon atoms?A.C2H6B.C2H4C.C2H2D.C2H4Cl2(Total 1 mark) 79.(i)Define the term isotopes.(1) (ii)A sample of silicon contains three isotopes.IsotopePercentage abundance / %28Si92.2329Si4.6830Si3.09Calculate the relative atomic mass of silicon using this data.(2) (iii)Describe the structure and bonding in silicon dioxide and carbon dioxide.(4)(Total 7 marks) 80.Draw the Lewis structure of NH3, state its shape and deduce and explain the HNH bond angle in NH3.(Total 4 marks)81.The graph below shows the boiling points of the hydrides of group 5. Discuss the variation in the boiling points.(Total 4 marks) 82.Explain, using diagrams, why CO and NO2 are polar molecules but CO2 is a non-polar molecule.(Total 5 marks) 83.How many bonding pairs and lone pairs of electrons surround the sulfur atom in the SF4 molecule?Bonding pairsLone pairsA.41B.40C.60D.82(Total 1 mark) 84.Which of the following best describes the formation of bonds?A.They are formed by the sideways overlap of parallel orbitals.B.They are formed by the axial overlap of orbitals.C.They are formed by the sideways overlap of an s and p orbital.D.They are formed by the axial overlap of either s or p orbitals.(Total 1 mark) 85.What is the hybridization of the carbon atom, and the number of and bonds in the methanal molecule?Hybridization bonds bondsA.sp231B.sp331C.sp340D.sp240(Total 1 mark)86.(a)(i)Draw the shape of the pz orbital using the coordinates shown.(1) (ii)State the electron configuration of Fe3+.......................................................................................................................................................................................................................................................(1) (iii)Define the term ligand.......................................................................................................................................................................................................................................................(1) (iv)Explain why the complex [Fe(H2O)6]3+ is coloured...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................(3) (v)The element selenium (Z = 34) has electrons in the 4s, 3d and 4p orbitals. Draw an orbital box diagram (arrow-in-box notation) to represent these electrons............................................................................................................................(1)(Total 7 marks) 87.Draw the Lewis structures, state the shapes and predict the bond angles for the following species.(i)SiF62(3)(ii)NO2+(3)(Total 6 marks) 88.Describe the structure and bonding in silicon dioxide.(Total 2 marks) 89.What compound is formed when lithium reacts with selenium?A.LiSeB.Li2SeC.LiSe2D.Li2Se2(Total 1 mark)90.How many non-bonding pairs of electrons are there in a nitrogen molecule?A.0B.1C.2D.3(Total 1 mark) 91.Which molecule contains a bond angle of approximately 120?A.CH4B.C2H2C.C2H4D.C2H6(Total 1 mark) 92.Which compound does not form hydrogen bonds between its molecules?A.CH3NH2B.CH3COCH3C.CH3COOHD.CH3CH2OH(Total 1 mark)93.PF3, SF2 and SiF4 have different shapes. Draw their Lewis structures and use the VSEPR theory to predict the name of the shape of each molecule.PF3SF2SiF4Lewis structureName of shape............................................................................................................(Total 6 marks) 94.What is the correct order if the compounds are arranged in order of increasing boiling point?A.CH4 < CH3Cl < SiH4 < CH3OHB.CH3OH < CH4 < CH3Cl < SiH4C.CH3OH < CH3Cl < SiH4 < CH4D.CH4 < SiH4 < CH3Cl < CH3OH(Total 1 mark) 95.What is the bond angle in the H3O+ ion?A.104B.107C.109D.120(Total 1 mark)96.How many atoms is each carbon directly bonded to in its allotropes?DiamondGraphiteC60 fullereneA.333B.433C.434D.443(Total 1 mark) 97.What is the type of hybridization of the silicon and oxygen atoms in silicon dioxide?SiliconOxygenA.sp3sp3B.sp3sp2C.sp2sp3D.sp2sp2(Total 1 mark) 98.SF2, SF4 and SF6 have different shapes. Draw their Lewis structures and use the VSEPR theory to predict the name of the shape of each molecule.SF2SF4SF6Lewis structureName of shape............................................................................................................(Total 6 marks)99.Transition elements form complexes such as [Fe(CN)6]4 and [FeCl4]. Deduce the oxidation number of iron in each of these complex ions.[Fe(CN)6]4 ............................................................................................................................[FeCl4] ..................................................................................................................................(Total 2 marks) 100.What is the formula of the compound formed when aluminium reacts with oxygen?A.Al3O2B.Al2O3C.AlO2D.AlO3(Total 1 mark) 101.Which statement is true for compounds containing only covalent bonds?A.They are held together by electrostatic forces of attraction between oppositely charged ions.B.They are made up of metal elements only.C.They are made up of a metal from the far left of the periodic table and a non-metal from the far right of the periodic table.D.They are made up of non-metal elements only.(Total 1 mark)102.How many electrons are used in the carbon-carbon bond in C2H2?A.4B.6C.10D.12(Total 1 mark) 103.Which compound has the highest boiling point?A.CH3CH2CH3B.CH3CH2OHC.CH3OCH3D.CH3CHO(Total 1 mark) 104.What type of solid materials are typically hard, have high melting points and poor electrical conductivities?I.IonicII.MetallicIII.Covalent-networkA.I and II onlyB.I and III onlyC.II and III onlyD.I, II and III(Total 1 mark)105.(i)Outline the principles of the valence shell electron pair repulsion (VSEPR) theory.(3)(ii)Use the VSEPR theory to deduce the shape of H3O+ and C2H4. For each species, draw the Lewis structure, name the shape, and state the value of the bond angle(s).(6)(iii)Predict and explain whether each species is polar.(2)(iv)Using Table 7 of the Data Booklet, predict and explain which of the bonds O-H, O-N or N-H would be most polar.(2)(Total 13 marks) 106.Predict and explain which of the following compounds consist of molecules:NaCl, BF3, CaCl2, N2O, P4O6, FeS and CBr4.(Total 2 marks) 107.Diamond, graphite and C60 fullerene are three allotropes of carbon.(i)Describe the structure of each allotrope.(3)(ii)Compare the bonding in diamond and graphite.(2)(Total 5 marks) 108.State two physical properties associated with metals and explain them at the atomic level.(Total 4 marks)109.How many sigma () and pi () bonds are present in the structure of HCN?A.13B.23C.22D.31(Total 1 mark) 110.How many lone pairs and bonding pairs of electrons surround xenon in the XeF4 molecule?Lone pairsBonding pairsA.48B.08C.04D.24(Total 1 mark) 111.(i)Apply the VSEPR theory to deduce the shape of , ICl5 and SF4. For each species, draw the Lewis (electron dot) structure, name the shape, and state the value of the bond angle(s).(9) (ii)Discuss the bond angle(s) in SF4.(1) (iii)Explain the hybridization involved in the C2H4 molecule.(4) (iv)State the hybridization involved in the ion and comment on the nitrogen-oxygen bond distances.(2)(v)Using Table 7 of the Data Booklet, predict and explain which of the bonds O-H, O-N or N-H would be most polar.(2)(Total 18 marks)